Js compilation falsy values slides

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JS compilation hot or not? Zbigniew Braniecki (gandalf@mozilla.com)

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let’s talk aboutbenchmarks

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5 categories ofbenchmarks

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5 categories ofbenchmarks • Real applications

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5 categories ofbenchmarks • Real applications • Modiﬁed applications (eg. with I/O removed to make it CPU-bound)

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5 categories ofbenchmarks • Real applications • Modiﬁed applications (eg. with I/O removed to make it CPU-bound) • Kernels (key fragments of real applications)

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5 categories ofbenchmarks • Real applications • Modiﬁed applications (eg. with I/O removed to make it CPU-bound) • Kernels (key fragments of real applications) • Toy benchmarks (eg. sieve of Erastosthenes)

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5 categories ofbenchmarks • Real applications • Modified applications (eg. with I/O removed to make it CPU-bound) • Kernels (key fragments of real applications) • Toy benchmarks (eg. sieve of Erastosthenes) • Synthetic benchmarks (code created artificially to fit a profile of particular operations, e.g Dhrystone)

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statistics

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statistics • How common is average?

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statistics • How common is average? • Biases (sampling, memory etc.)

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statistics • How common is average? • Biases (sampling, memory etc.) • Measuring the right thing is hard

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statistics • How common is average? • Biases (sampling, memory etc.) • Measuring the right thing is hard • Reducing complexity

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History How did browserJS performance improve over time

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V8

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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V8 5000 3750 2500 1250 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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SunSpider

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SunSpider 20000 15000 10000 5000 0 1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

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SunSpider

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SunSpider 3000 2250 1500 750 0 3.0 3.5 3.6 4.0 Nightly-JS

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Kraken

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Kraken 50000 37500 25000 12500 0 3.0 3.5 3.6 4.0 Nightly-JS

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Types of JIT method vs. tracing

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method JIT heap 10 9 8 7 6 5 4 3 2 1 0 a b

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method JIT heap hot loop! 10 9 8 7 6 5 4 3 2 1 0 a b

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tracing JIT heap a 10 9 8 7 6 5 4 3 2 1 0 a

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tracing JIT heap b 10 9 8 7 6 5 4 3 2 1 0 a b

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tracing JIT heap b 10 9 8 7 6 5 4 3 2 1 0 hot trace! a b

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How browsers compilestuff • Chakra (IE) - method • Carakan (Opera) - method • Nitro (Safari) - method • V8 (Chrome) - method • JägerMonkey (Firefox) - trace + method

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method vs. tracing

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How to helpJIT hot loop! b hot trace!

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What to avoid • competing heaps • variable type changing • evals • looong methods

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Future • Dead code elimination • Type Interface • Function inlining • CrankShaft (Chrome) and IonMonkey (Firefox)

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Questions?

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Thank You!

Js compilation falsy values slides